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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3591b34b580917640b82b5c445370279e2a8fdfdb8d045fba19c5fd82c878d4e' 
  AND token = 'sz35027Le61lov3gmtHXfsDGTPdIpaj1TxX6Uoli8Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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