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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6e9dfb1fb7f6e5c7a003720b0a8f1b2a36cda172a06b6fa35385e25730877d' 
  AND token = 'CXOjHmRUSAfLUV3WxF1GC+xjEkGwWA0pbaMtBBu+3K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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