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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90de667a590a3e97424439bfa9e25749ab37291a795db79a5381b16162cd506c' 
  AND token = '6Gj6kAmrsAwYSz/T8gemuVllg7ENvt4mT9n7EVO/16o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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