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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3413ca81d6b6d3477be176b6e2594f03a1770070ccc58ba861937bb4560b8b96' 
  AND token = 'DJ88Q2uQRM3ty+YXQ5OpasyJvLeu6ZdeLMGHmkDvO1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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