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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6fde3aeadc484b5701bda54a23a57e7e68271823d5db82f56330a92df160a5c' 
  AND token = 'wox4X4hOyBgIGIHfdJMpSapOzzS9QQEz/JJMPXlL7J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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