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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae1afffde168eb3fc07aed712ec0a4beea154ee79c331c3c30cb48f482c0377' 
  AND token = 'xgXGNjtQxzhD8Y45H8J9jvWdI7giRKUrNDpqrLQw0No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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