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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc1de7b0911b8a37e37c28024a5f3a2e1d9be27a941c969e444c3ab09640aac' 
  AND token = '5rNP6SNrj5sPqblJhT00VAIr/IF5f9kyPq30y5Wg02U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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