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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560380ac858532152b276d36ec9e0ee31e3ac52ee1781ffbf7b46b503bb14a34' 
  AND token = '4+gOHUYqs3JPpgbafsbsl7hbgYnr7mSxOAvyopIzNr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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