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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc722ccdfded6c1943b7ad87cd81c66b5e80ad6093257e65259ec8fae3fbd2e' 
  AND token = '6oq5Fu5AVsXCBSqplFSfMbcVWftTDJqznM9jokSMq6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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