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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '181dd82bf3fc6a4163031ddae39ee6870c0f55672b98c332e4e5026fbf513df5' 
  AND token = 'Nxp69yMYE0fH7UeciVvhqzKSe633o508GSDqhaW6qlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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