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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e8af49e84514925a6c59554ce6554ff085112ec991959ec59adf0a59e5b9ac' 
  AND token = 'CN5eN7/bJL0MfB5MNDoiSBTB7gtjf5JG1jKea1ocv8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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