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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f2d7fc1928a5c9e2c14064fcfe31b8abf1cf5b504f95804d1f894fdda0228ba' 
  AND token = 'wsV8ccSGh5+7mn77GpOEt1ndVzE6D1ptw+PuEx1qVho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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