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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c840110f4d68ebdaeb3a5b4d67ca9f9f80a41694fb3816c5ce7cd575d61f0b' 
  AND token = 'ZlQw+HhenPvI0QDv/+vApbRcM5U6ASWV0lL6u9gBAmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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