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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cedcb954b441757b7c2c16d9fdc82aae6f2ec911bbc7b70ba936d24c861c62c' 
  AND token = 'aD3eW/RmwccKS9ZyE6gUCFzcALf0nEt/Q2+5Y4molI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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