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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2aa0d8fa22f7899925f4cd10f66bb2cc998b11a44950b02eee18eaf5c9fb224' 
  AND token = 'Bb2uBuB/ALa3wruo8c3MX0NewZHr+B198lvXwfnzrVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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