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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17dc44d0cab4bc7f798924dc8cd83a277c96681937c05f4cb707ac301225d8a6' 
  AND token = 'OeYhVaYyon/2TaRWMlzy9s9wNckhC1QF01fbswfi6cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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