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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2d5c8839d72c69cf3a0c4dceb2f463fde067a4a6266732cc2cea4d29ce6d4b' 
  AND token = 'WpA7sLzfn7Sj5L7QU9c5Gw+AZb8n191JMs3XVPrhWx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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