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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b54b1ac7b1feb41a326cfc8d9cc38e08dff3b9c1046595999c56bed93f5dfe6' 
  AND token = '6M2f98BPLiTTZwWyNW9YWXMSvrRSoHhQzePqJzldO4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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