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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5631248e33480398afc1bab64ca3eb35f0cffe4fef5ea0ac149a59055b1dc786' 
  AND token = '0bJ+QqvqVUNzrFW29qCluSaTj/8YIjEc7tX4CSpdTkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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