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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67251c86cf525b20387f6a32e10caa2b1678aabe63381413eca062bd69153cbd' 
  AND token = '5VtgL1+J4c3x5Ir6jKMYIUi9oLM+OlMI06uh/uN3oNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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