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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab9d120a50297093c5cd42d23c440ad2eb97137ee52597b65f94b7940e7794d' 
  AND token = 'gbRkBwhSSsI+kRisCTBZh3QJXASBYUr6fUfDoflmqcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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