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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06667cac1ce6d027cdb8603d85d61c8d9815aaa3dcb9d4bfa3e2fc9300fb1ee8' 
  AND token = 'jeEXk3lfnZLY8Eszd6ozqEns7v3s722kaoqdTsjSNtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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