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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20a64d85650210cf12cf69ba419a5c93da4ddeebe17734dbb121ae60355ae80' 
  AND token = '0vYu7MB+cbe3m41UR9cdh1R9a8ylUtrwlPsj2ytWvcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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