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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998682fffdc4b887dcbb72e5ee28a1dec876dbcafd02f45c17ff095d678e0caa' 
  AND token = 'X8MX0hzLS119OwZ79C4XuVDh1/Nzo9o9kJuxZkunonY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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