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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dfe7745eea04512e59031a694b8d7124dc08f63af2577dc59911eba4bdf2225' 
  AND token = 'S+ZDAnE8vENadYT2896LbIrJGObKAwXo/5ze10unnv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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