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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d989c9d3da4b01c09e14902f63a081437f33fa18f390a1d1d64421be750e6b' 
  AND token = 'sN+NyY3iQLout9p3kleVp2gX0cFCARXriQMjNOWSoJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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