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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975dd380c6b2f4424a08badb5170230cb603b382e5c1325a4ea0ab1c0d98edee' 
  AND token = '9cWwfSyVyK3W5ybdY6YB/iUsL1HV8EhtCxdP4N6J4H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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