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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33abbda2a10cf8cff7bd07ab212d85f1b49e2a5777f2804f2a2cfc2abdb9bb4e' 
  AND token = 'ixcyFvznvg8/kYIfRHrxcTZmT5TfLsf8apd2CL7TY40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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