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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b524ec67cc59773969231bf19604c20c99491a29df30f655540a68f526a4af3b' 
  AND token = '1XZ9v2m/7ehc45SPZdRwGVlFdBCqWXqR116xlcsaBnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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