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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '343b7e3c031bd6abae7b327d420693fb0648a5745ae0a40b03c6960863ae5192' 
  AND token = 'cGL9fBNONfobNrJ3DYuMVt2ps63zeHNuaapD8UaRHLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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