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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d735feb16e03ba81fbd8310f67fa6d559df82db9593cab9df192e1f8dc8c46d' 
  AND token = 'o143r5SeOBbxZmnzGCPtgpauuGIl2um0Ethx1JyYtBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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