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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371b95045f372bc00f03d372592bc2f9634bc04618dff89c24e90c78b5f2e218' 
  AND token = '8D6Pb/WNQjWba0KMayVnUrWDCkvwURUwY3KYCo9bLkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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