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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74098ad5a92d65a71fab0c0ce15425c6851403e752a2bdfa30fd783f75535618' 
  AND token = 'shBRLsH8IFTSdF4bBvhqWJWSYkY5XxRxeKYI988p4Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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