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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa10c30bbf709eb8dc0f7587d12904f199d0e280f6b7cb8bda7670023d9fd24b' 
  AND token = 'WMc4rIKAk+ZWs9aDcdOneXrUJY05QDpDLx70QXs4q80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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