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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7204433f85b95dd4a61e1c1b3200e2fe09514780b9e8f1436a58ad158fc2a33b' 
  AND token = 'gn3uABY17iyCQpxa1CRAHs/DwLRYlnQ9vfjxyuYK23Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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