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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca66382701f95e8b90cf34ce1b4fb862fee53d91b88416f684e83204421b5ff' 
  AND token = 'LOwlKL5pR9Pr9j2iFSrProtwWR16SFEOpB83VfynJ8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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