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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39233b6da5aed4f72e1f9ba0079da0fe04f1af87dd22200213a3876d621d30eb' 
  AND token = 'a9+wvnoKZ8FOaJ3hDnML3uGtobuG4mR3Gqg1wJDbRcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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