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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c868f9f6d9a3c9c7bb50fc4ade9f02fafa3322fbe03fc59e7cc48497794b4c53' 
  AND token = '699OH80S4p9aK5s+dnLz/Nqjr5sGgFpTS2nAGenxnaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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