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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4a03f4f4fcdcad12d0642eb5dab7f14352c872b5bb3fb2baef2cbb5a00f8b8' 
  AND token = 'ZJp+knJ/Qua310180xX2Mc9W5IlZznh4RJJwxSIvwrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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