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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df0bb2132693bb77bd5be046316593198f7ca5608872102a701b9ed98160ef7' 
  AND token = 'J4t+kPiAKUVmVnosdqTp5VrVj5H2tTvpfvQhnL4OR04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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