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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b4cf22c5df51cef68a5c5c4215a95718cdf07ebca949622e08684a9eef6f6c' 
  AND token = 'UKDFVqfeoMg1nDmSdf0uqklJu50Asxa2ggJNrEXn7PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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