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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdca3b484a7e83da79a228c28f5d2bf0d4445ca305e765723209e612f250261e' 
  AND token = 'OMIKdWCoeK7vBmGyo8F2Ldx1C0J+fl9pCpJMsPqvzw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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