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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb70e10c3274dbe9b3d14a46b5038d24c2b7b087112fd98442a23608ace077b' 
  AND token = 'xF/t9cQMgMml6YMsVk9qURZ2jhVmS/MYW/5Ipy/eXtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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