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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd499e0e9928be2da25322a2337870789480bb953fc5c30facea4c6b5ace763da' 
  AND token = '9FXYUEPK9oLVr2b9AqIf8yOgbUyqzfhNN2O9qjF1zN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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