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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5b22e32445328e2208c26db9ac8f27bcfd10a210e5a1de1e5c92be9a8d1b7c' 
  AND token = '1srgg5sO4gY9QyQH1cVrQzDrKzhHCpUPu1pVSUZZYRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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