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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd689735a9fda629662ccbd719f956265ea231bfed1bc4ef8a96076a589d24a0c' 
  AND token = 'Fo32145Pa40zG9CoaZpmJ62OQIDn1SrpHMdg8Q2Qpew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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