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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2dc7ee5cd3c3aa5d5ba253d38985714d692a081277da49747f3488077698a23' 
  AND token = '5dv5whBjHZUX7Sv3e1SVVOeYKqAqdmVh5Wm5k5Yilts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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