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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7a7049fcf669eb373bec665886acb2569e0b37322628ce84640a6814f0c650' 
  AND token = 'Y7EXrVlW2nKBYDfYiCtLyhHtmzgUP8IHo/3+DaCKa+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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