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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44d3d183ee3f781a0c839b8d0828407f83cd72afa9fec683b32e748c172fc04' 
  AND token = 'D7CbWOU0OytdSlpOCOf5tZeedYmbVBJvamgfgWpPtVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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