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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3831a8946197435cc93486ddb1800c443c9ea6db8eae323ebd6174d752b7e5f' 
  AND token = 'bUyTSdFEKj6rehSM6J4p9Kik6zhfeQvAowfUFxi+pJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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