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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d3b635b32fa41fbeb059a15af206e518c8295b9c87752d8be36ca992f7023c' 
  AND token = 'ViJR0YBtqD0veMHX1mIemFwexBYBZOKaw26RneXlM5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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