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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9708f7d93acedf18d27c10e633c522cc87e745ac6bfac18c42d824e02f632610' 
  AND token = 'lTWZkXA3BaYjA9dBw7RIbhU+cFX9XTPZ1KA82rsCSZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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