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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '445a2d3bcb503390373cab76f5905dec0c3a36a47031dd6d6416e9bf0488ed4f' 
  AND token = '3zXEAVRfD5ClIfzkjA/qmK7lRDJKKN0XOCtRlB6Lhck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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