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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873c966606d36b876fc211c847b71221b0d797a740f4a9b849e0316ea28d47d9' 
  AND token = 'WA89A5hXahu5W7Q0Zti7zW6oZ24RehhLqQluXuLEvnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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