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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0493cb8f66695fff2094f09efa2dc5eafda859a99635183afe03dd4d720e9692' 
  AND token = 'W68Mi0E9EWQBY57Alb1Q5r5D6w8lvGm2KvxvsXgw/zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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