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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7cef2379eb95a8bbe012ebc7946c649d8ef7c14589c4459c4e914dc05c98b8' 
  AND token = 'rWhvEbR+ptUymQjiYneUuInH3jcBI8iRGQfpPPK6urI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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