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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c709e09f447d9ec312549e3b420a918695354617e47959ae80b1c2060d6d4699' 
  AND token = 'pONvw+1mKoH+mXHL4Q87yAZXk0mrZfDALu4QLXmGsDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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