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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd6a4140ec6eddc50870b0cf120d3d4be419dd7363de05b48dd9212c3bdeb09' 
  AND token = '3Am+/lrrZSzt1CQ+wRL+zFc9IokD3W7Jhkyrl016x34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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