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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35c255a92a5e15e9e44231da239f104f179683a24fe2b47aaf90659c15cb432' 
  AND token = '7k8WtgtpYM+hO3Ha10wi+WPU+Y8MvmT99HnewME/6Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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