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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd47311a21572f383715d42c595cd4549fa6a0f3b5a676290c36f95ce79d2fb' 
  AND token = 'sAdV3XtQytFIVr8Eh250g+tuq8PgTkZHejjUwGAb9Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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