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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ab63bf6e8291d9644fc537929ed671bd7ad80b327314b29f732e924562f8f2' 
  AND token = '8OW9TVLbmhbwF0YxZ26SXi8JMEBvOnR/tcnXk31tqtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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