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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3799d37f165312c0d64a71b9e5c9ea2fcfe778e3e4c43eb16175437598713e4f' 
  AND token = 'M7pw6PNneXdOATe7dw/VikTD0unLGLA9aIiL/MUITAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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