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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8bed6333b0fd18c89b3631ab0c1b5ce67748a5b42ff18ff9f9811b568212c02' 
  AND token = '6QkBDIeTlC6tDd7HJy0mf8o0CoXjx5Wh1TX+aPMrQXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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