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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f3db72004769913ab7f2bed45e09fbdf6797a4973ad771b88e16d27938c273' 
  AND token = 'cry8t34o7OHKuDSINl9QBy7IDX1qd6kjEh0X+YBYuvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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