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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33423cca291b33a982c71bd26ea67f99cf63b8a02eefb1208e544050ad407810' 
  AND token = '+tUT5bur+RlTU23aEmDiBeX8gQ9cOmiUAUZ5RKqjoGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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