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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f948d130c44b5032d4eba31d5215852683db89380e640860e341e977d9cc98f4' 
  AND token = 'DxZLFuPTDL6EeH0KkwmoQTj1D9WP8dNbWKpWXwzyS/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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