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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f0fa72bbab841589622bc7ff9d2bbb5c7375c50d3afde693842c9f0cb8ed6b7' 
  AND token = 'exfnlp6AdbIPEp/MZipQ4wuzn3x6c1XcPI6Fk61mCD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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