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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99fb312953aed433e7367cbc5590dadf875a668050aa922055164e3b723aa3ad' 
  AND token = 'vjAz8rA/7lEa0GLNbIFuUwC/qDf0//geRRi5lI/1SHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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