SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0c09f08d2cc4afeaaeaa943fcde130461162dd9ef38fa29f55afb58418c318' 
  AND token = 'CJiUNTK71kIHcp4c1xGMUXY06hX0/g5r5DxBwf3TLRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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