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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfb0d2bc73a1cbfde15dc225d7fa91d2f71a71f43565f0784dd2c27740496e7' 
  AND token = '6CnTxTyxljs1SySdqa1KgVQYejiqqkMD6LanzxoSUC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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