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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '395cb512d5cd6c98ea51981ac1c3d38402599233191f5ec36a1fdb4661569214' 
  AND token = '3mUv4rw2GWfbV2n0xmJbFqeCxBtIFSBALVYnGz+xyOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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