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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9723aea4829466215dfc69c23fc747e10e6b9a597ec64c5207967cfe1d7cf361' 
  AND token = 'rQItt+WQFucuwg5R8RJHneufQb3gVlhgy4vy9dZU9XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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