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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f9b5884c4bba5aa26efd0cb581ab9d77d992993da1e2f84d168815b360da3c' 
  AND token = 'mT0j7bi80vlEzuFtpr2DuE4dLzsTv2jw66iglTenQOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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