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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e44b13b31a52f3784affdf8338239304541fb5d93e5b3bf9ff9ec4e2b47e87a' 
  AND token = '10+CJQOk6oBGcoawXfY831yyZXyvERc4gOUJ/3NsBZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}