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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a04ea88b79a6f84df011c6f4f7c5a62f0f4306399fcab9004f595f331f63294' 
  AND token = '132J28dA6tQT3lZGB/QysgbZlpbof4QgURppaFB3GSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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