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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6da9193acef8c37988577925950a7d3146c24c62862ad57e5fe5b10f465df8' 
  AND token = 'CNoCRO9KiIj8USxHOn6FsMjDpg7aVjRAhgX7IrWBoyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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