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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5d7bba9550cfa592a260d6ec59c05dfafd5769515ce232f213adffb54780d2' 
  AND token = 'NHfdO5MsI5Fqp/0Z4yFujDF6RnYxpQnIwptmHKVSrnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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