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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d12fd5cbf3f6f824562e9884e19b6ca788e7dc31d521cb148034642c6a39ee' 
  AND token = 'm25V00W8PSYjyZrVlUemPZjoh7OLe0eHQQhEoWX/b54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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