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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca84c53f2dbb5d6e2f52a8e5621a492da716644bc417b8ce3bd78fc701c35b1f' 
  AND token = 'MOczm9YJ2+ZSdGzE0kmd9lXyHkwbrZgfcprW/KXfCC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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