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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c73a0866eaa340015b7554cc6f5315734fea206ad00701266730d5939338c26' 
  AND token = 'DGAracrobrcogBw5ZvEU4Por3UX0ntE2mHur/y3uBt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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