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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6399e2b053d745dc8bb2933856f3d90a81a40d7764a0e6461620d82e7b9a72c4' 
  AND token = 'LWnszs2CJwpbTuiVWgnahg/UNU5ow03v6z9VnrF15XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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