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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f87d55402cf4c322f0dbec7e81c7bcc98504624932d89948438ba0cab4a56ed' 
  AND token = 'm9o0hhWt6eIzsDrY7+4ZVCPH8ZgEMvoHS8OHPUI5NJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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