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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4be706d56031a0be1be01a61d6b2e888cce5e234fd371fb041a3d60de7d0a6f' 
  AND token = 'xS8n0NzV9hyJqENbQN6cBM/LFje0R368EGr6jMmj8HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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