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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bebcde130902da3904a8b577d17d061bf7c431b64cd7f64d8fa51ec1e3e6e315' 
  AND token = 'lNdt1z7xQYnLVU3Vz6jbfyEMbNlT8C7k9jJKU0yydmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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